GitHub is hosting a meetup in Portland on September 9th at 7 PM at Rontoms, encouraging developers using various programming languages like Python, Ruby, Clojure, or C to attend. The event offers an opportunity for distributed version control system enthusiasts to socialize and celebrate GitHub's mascot, the Octocat. The venue is conveniently located a short distance from the Doubletree hotel, accessible by a free bus ride or a brief walk, and attendees are advised to look for someone wearing a "Fork You" shirt as a point of contact.